Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual número está em Bois de Warville com um tempo inferior a 810?
 ###Tabelas: CREATE TABLE male_singers (male_singers_id AUTO_INCREMENT PRIMARY KEY, English name VARCHAR, Chinese name VARCHAR, Year signed INT, Year separated VARCHAR, Reason for separation VARCHAR) CREATE TABLE grac_member_information (grac_member_information_id AUTO_INCREMENT PRIMARY KEY, School VARCHAR, Location VARCHAR, Team Name VARCHAR, Colors VARCHAR, Varsity Teams INT, NJCAA Championships INT) CREATE TABLE verified_aerial_victories (verified_aerial_victories_id AUTO_INCREMENT PRIMARY KEY, Number INT, Time INT, Aircraft VARCHAR, Opponent VARCHAR, Location VARCHAR) CREATE TABLE season_14_1968_69 (season_14_1968_69_id AUTO_INCREMENT PRIMARY KEY, Series # INT, Season # INT, Title VARCHAR, Director VARCHAR, Writer(s) VARCHAR, Airdate VARCHAR) CREATE TABLE current_membership (current_membership_id AUTO_INCREMENT PRIMARY KEY, School VARCHAR, Location VARCHAR, Mascot VARCHAR, Colors VARCHAR, Enrollment INT, IHSA Classes 2/3/4 VARCHAR, IHSA Music Class VARCHAR, IHSA Football Class VARCHAR, IHSA Cheerleading Class VARCHAR)  
SELECT SUM Number FROM verified_aerial_victories WHERE Location = bois de warville AND Time < 810